81886434 has 32 divisors (see below), whose sum is σ = 187797120. Its totient is φ = 23317632.

The previous prime is 81886403. The next prime is 81886451. The reversal of 81886434 is 43468818.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10032 + ... + 16260.

It is an arithmetic number, because the mean of its divisors is an integer number (5868660).

Almost surely, 2^81886434 is an apocalyptic number.

81886434 is an abundant number, since it is smaller than the sum of its proper divisors (105910686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81886434 is a wasteful number, since it uses less digits than its factorization.

81886434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6554.

The product of its digits is 147456, while the sum is 42.

The square root of 81886434 is about 9049.1123321572. The cubic root of 81886434 is about 434.2474927511.

The spelling of 81886434 in words is "eighty-one million, eight hundred eighty-six thousand, four hundred thirty-four".